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[PATCH tip/core/rcu 0/6] Miscellaneous fixes for 4.7

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Hello!

This series provides miscellaneous fixes for RCU:

1.	Consolidate RCU's single-shot dumping of the ftrace buffer.  
	This is a bit widespread, so the upcoming documentation,
	expedited-grace-period, and torture patchsets are also based
	on this patch.

2.	Awaken grace-period kthread at RCU CPU stall-warning time.

3.	Move the FQS timeout farther into the future only if the current
	wakeup actually resulted in an FQS scan.

4.	Awaken grace-period kthread if too long since FQS.

5.	Remove superfluous versions of rcu_read_lock_sched_held(),
	courtesy of Boqun Feng.

6.	Dump ftrace buffer when kicking grace-period kthread.

								Thanx, Paul

------------------------------------------------------------------------

 include/linux/rcupdate.h |   30 +++++++++----------
 kernel/rcu/rcutorture.c  |   17 +----------
 kernel/rcu/tree.c        |   71 ++++++++++++++++++++++++++++++++++++++---------
 kernel/rcu/tree.h        |    2 +
 kernel/rcu/update.c      |    4 +-
 5 files changed, 79 insertions(+), 45 deletions(-)

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[PATCH tip/core/rcu 0/6] Miscellaneous fixes for 4.7 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-04-12 17:10 +0200
  [PATCH tip/core/rcu 4/6] rcu: Awaken grace-period kthread if too long since FQS "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-04-12 17:10 +0200
  [PATCH tip/core/rcu 6/6] rcu: Dump ftrace buffer when kicking grace-period kthread "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-04-12 17:10 +0200
  [PATCH tip/core/rcu 2/6] rcu: Awaken grace-period kthread when stalled "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-04-12 17:10 +0200
  [PATCH tip/core/rcu 5/6] rcu: Remove superfluous versions of rcu_read_lock_sched_held() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-04-12 17:10 +0200
  [PATCH tip/core/rcu 1/6] rcu: Consolidate dumping of ftrace buffer "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-04-12 17:10 +0200

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